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Commit c3b9566d authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Ralf Baechle
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MIPS: JZ4740: Add serial support 



The JZ4740 UART interface is almost 16550 compatible.
The UART module needs to be enabled by setting a bit in the FCR register
and it has support for receive timeout interrupts.  Instead of adding yet
another machine specific quirk to the 8250 serial driver we provide a
serial_out implementation which sets the required additional flags.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1403/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent eda0347b

arch/mips/jz4740/serial.c

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Original line number Diff line number Diff line 
/*

 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>

 *  JZ4740 serial support

 *

 *  This program is free software; you can redistribute	 it and/or modify it

 *  under  the terms of	 the GNU General  Public License as published by the

 *  Free Software Foundation;  either version 2 of the	License, or (at your

 *  option) any later version.

 *

 *  You should have received a copy of the  GNU General Public License along

 *  with this program; if not, write  to the Free Software Foundation, Inc.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */



#include <linux/io.h>

#include <linux/serial_core.h>

#include <linux/serial_reg.h>



void jz4740_serial_out(struct uart_port *p, int offset, int value)

{

	switch (offset) {

	case UART_FCR:

		value |= 0x10; /* Enable uart module */

		break;

	case UART_IER:

		value |= (value & 0x4) << 2;

		break;

	default:

		break;

	}

	writeb(value, p->membase + (offset << p->regshift));

}

arch/mips/jz4740/serial.h

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Original line number Diff line number Diff line 
/*

 *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>

 *  JZ4740 serial support

 *

 *  This program is free software; you can redistribute	 it and/or modify it

 *  under  the terms of	 the GNU General  Public License as published by the

 *  Free Software Foundation;  either version 2 of the	License, or (at your

 *  option) any later version.

 *

 *  You should have received a copy of the  GNU General Public License along

 *  with this program; if not, write  to the Free Software Foundation, Inc.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */



#ifndef __MIPS_JZ4740_SERIAL_H__



void jz4740_serial_out(struct uart_port *p, int offset, int value);



#endif